1 /* 2 * Qualcomm Peripheral Image Loader helpers 3 * 4 * Copyright (C) 2016 Linaro Ltd 5 * Copyright (C) 2015 Sony Mobile Communications Inc 6 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/firmware.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/notifier.h> 22 #include <linux/remoteproc.h> 23 #include <linux/rpmsg/qcom_glink.h> 24 #include <linux/rpmsg/qcom_smd.h> 25 26 #include "remoteproc_internal.h" 27 #include "qcom_common.h" 28 29 #define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev) 30 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev) 31 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev) 32 33 static BLOCKING_NOTIFIER_HEAD(ssr_notifiers); 34 35 static int glink_subdev_probe(struct rproc_subdev *subdev) 36 { 37 struct qcom_rproc_glink *glink = to_glink_subdev(subdev); 38 39 glink->edge = qcom_glink_smem_register(glink->dev, glink->node); 40 41 return PTR_ERR_OR_ZERO(glink->edge); 42 } 43 44 static void glink_subdev_remove(struct rproc_subdev *subdev) 45 { 46 struct qcom_rproc_glink *glink = to_glink_subdev(subdev); 47 48 qcom_glink_smem_unregister(glink->edge); 49 glink->edge = NULL; 50 } 51 52 /** 53 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc 54 * @rproc: rproc handle to parent the subdevice 55 * @glink: reference to a GLINK subdev context 56 */ 57 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) 58 { 59 struct device *dev = &rproc->dev; 60 61 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge"); 62 if (!glink->node) 63 return; 64 65 glink->dev = dev; 66 rproc_add_subdev(rproc, &glink->subdev, glink_subdev_probe, glink_subdev_remove); 67 } 68 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev); 69 70 /** 71 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc 72 * @rproc: rproc handle 73 * @glink: reference to a GLINK subdev context 74 */ 75 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) 76 { 77 rproc_remove_subdev(rproc, &glink->subdev); 78 of_node_put(glink->node); 79 } 80 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev); 81 82 static int smd_subdev_probe(struct rproc_subdev *subdev) 83 { 84 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 85 86 smd->edge = qcom_smd_register_edge(smd->dev, smd->node); 87 88 return PTR_ERR_OR_ZERO(smd->edge); 89 } 90 91 static void smd_subdev_remove(struct rproc_subdev *subdev) 92 { 93 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 94 95 qcom_smd_unregister_edge(smd->edge); 96 smd->edge = NULL; 97 } 98 99 /** 100 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc 101 * @rproc: rproc handle to parent the subdevice 102 * @smd: reference to a Qualcomm subdev context 103 */ 104 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 105 { 106 struct device *dev = &rproc->dev; 107 108 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge"); 109 if (!smd->node) 110 return; 111 112 smd->dev = dev; 113 rproc_add_subdev(rproc, &smd->subdev, smd_subdev_probe, smd_subdev_remove); 114 } 115 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev); 116 117 /** 118 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc 119 * @rproc: rproc handle 120 * @smd: the SMD subdevice to remove 121 */ 122 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 123 { 124 rproc_remove_subdev(rproc, &smd->subdev); 125 of_node_put(smd->node); 126 } 127 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev); 128 129 /** 130 * qcom_register_ssr_notifier() - register SSR notification handler 131 * @nb: notifier_block to notify for restart notifications 132 * 133 * Returns 0 on success, negative errno on failure. 134 * 135 * This register the @notify function as handler for restart notifications. As 136 * remote processors are stopped this function will be called, with the SSR 137 * name passed as a parameter. 138 */ 139 int qcom_register_ssr_notifier(struct notifier_block *nb) 140 { 141 return blocking_notifier_chain_register(&ssr_notifiers, nb); 142 } 143 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier); 144 145 /** 146 * qcom_unregister_ssr_notifier() - unregister SSR notification handler 147 * @nb: notifier_block to unregister 148 */ 149 void qcom_unregister_ssr_notifier(struct notifier_block *nb) 150 { 151 blocking_notifier_chain_unregister(&ssr_notifiers, nb); 152 } 153 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier); 154 155 static int ssr_notify_start(struct rproc_subdev *subdev) 156 { 157 return 0; 158 } 159 160 static void ssr_notify_stop(struct rproc_subdev *subdev) 161 { 162 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 163 164 blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name); 165 } 166 167 /** 168 * qcom_add_ssr_subdev() - register subdevice as restart notification source 169 * @rproc: rproc handle 170 * @ssr: SSR subdevice handle 171 * @ssr_name: identifier to use for notifications originating from @rproc 172 * 173 * As the @ssr is registered with the @rproc SSR events will be sent to all 174 * registered listeners in the system as the remoteproc is shut down. 175 */ 176 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, 177 const char *ssr_name) 178 { 179 ssr->name = ssr_name; 180 181 rproc_add_subdev(rproc, &ssr->subdev, ssr_notify_start, ssr_notify_stop); 182 } 183 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev); 184 185 /** 186 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source 187 * @rproc: rproc handle 188 * @ssr: SSR subdevice handle 189 */ 190 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr) 191 { 192 rproc_remove_subdev(rproc, &ssr->subdev); 193 } 194 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev); 195 196 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver"); 197 MODULE_LICENSE("GPL v2"); 198